Hi again Tatter! I'm not an expert but once upon a time I remember reading through some AKC material on acceptable lab markings. If I remember right, white spots on pure bred lab pups are not entirely uncommon. I recall that small white spots on the chest were "permissable but not desireable" traits. Genetics are an odd thing, and the bottom line is they could be pure bred and still have such marks, but it does raise the question. I'm pretty sure that spots in places besides the chest are a reasonable indication of a mix, and they likely don't meet AKC standards if the white appears anywhere besides the chest.